I tried to make DR center to our company

The purpose is to connect to out company

for our internet customer

If we do it, We must setup external DNS server for delication to GSS?

If not, only to use GSS archive our purpose?

For example, for External GSS and advertise external gss's ip to ISP

the ISP look at our external gss ,

when the dns query reached to our gss,

the gss reponse the answer to isp?

Is it possible?